&< — 如果 A 的边界框与 B 的边界框重叠或位于 B 的左侧,则返回 TRUE
。
boolean &<(
geometry A , geometry B )
;
SELECT tbl1.column1, tbl2.column1, tbl1.column2 &< tbl2.column2 AS overleft FROM ( VALUES (1, 'LINESTRING(1 2, 4 6)'::geometry)) AS tbl1, ( VALUES (2, 'LINESTRING(0 0, 3 3)'::geometry), (3, 'LINESTRING(0 1, 0 5)'::geometry), (4, 'LINESTRING(6 0, 6 1)'::geometry)) AS tbl2; column1 | column1 | overleft ---------+---------+---------- 1 | 2 | f 1 | 3 | f 1 | 4 | t (3 rows)